# 两个乘号，代表乘方
print(3**3)

# 两个加号，还是6
print(3++3)

# 两个减号，是6。神奇
print(3-3)
print(3--3)

# 两个除号，还是1
print(3//3)

# 0.4
print(0.2+0.2)

# 0.30000000000000004
print(0.2+0.1)
# 0.30000000000000004
print(3*0.1)

# 类型错误，age为int，需要将age转化为字符串
# Python是强类型语言
age = 23
message = "Happy " + str(age) + "rd Birthday!"
print(message)

# age为string，可以使用字符串拼接
age = "33"
message = "Happy " + str(age) + "rd Birthday!"
print(message)